It is determined by the parameter combination of the fuel injection pump test bench. High-pressure tubing is used in EFI test-bed. The process of transmitting the pressure wave that pressurizes the fuel at the fuel injection pump end to the fuel injection nozzle end is a very complicated process, and there is no effective control. By experience, through the parameter combination of the fuel injection pump test bench, the fuel injection time is finally determined by experiments. The fuel injection pump test-bed is a special equipment for testing, adjusting and maintaining the fuel injection pump of diesel engine.